DL2SBA¡¯s website indicates:
¡°vna/J is an alternative application for the following network analysers miniVNA, miniVNAPRO and miniVNAtiny from mini Radio Solutions and the MAX6 from Jarek, SP83SWJ and Gregor, SP8NTH¡±
That series of VNA¡¯s uses a significantly different architecture, and I think one of the Atmel processors. Their cost is much higher also.
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Gary, N3GO